Sending JSON in POST request with Retrofit2

Question

I\'m using Retrofit to integrate my Web services and I do not understand how to send a JSON object to the server using a POST request. I\'m currently stuck, here is my code:

Answer 1

This way works for me

My web service

Add this in your gradle

compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.retrofit2:converter-gson:2.3.0'
compile 'com.squareup.retrofit2:converter-scalars:2.3.0'

Interface

public interface ApiInterface {

    String ENDPOINT = "http://10.157.102.22/rest/";

    @Headers("Content-Type: application/json")
    @POST("login")
    Call getUser(@Body String body);

}

Activity

   public class SampleActivity extends AppCompatActivity implements Callback {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sample);

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(ApiInterface.ENDPOINT)
                .addConverterFactory(ScalarsConverterFactory.create())
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        ApiInterface apiInterface = retrofit.create(ApiInterface.class);


        // prepare call in Retrofit 2.0
        try {
            JSONObject paramObject = new JSONObject();
            paramObject.put("email", "sample@gmail.com");
            paramObject.put("pass", "4384984938943");

            Call userCall = apiInterface.getUser(paramObject.toString());
            userCall.enqueue(this);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }


    @Override
    public void onResponse(Call call, Response response) {
    }

    @Override
    public void onFailure(Call call, Throwable t) {
    }
}